package com.atguigu.observer.improve;

/**
 * @Description: 被观察者接口, 让WeatherData 来实现
 * @Author lixiaolong
 * @Date 2023/10/12
 */
public interface Subject {
	
	public void registerObserver(Observer o);
	public void removeObserver(Observer o);
	public void notifyObservers();
}
